+4) Enable "automatically reserve memory for kexec kernel" in+ "Processor type and features."++ CONFIG_KEXEC_AUTO_RESERVE=y++ This will let you to use "crashkernel=auto", instead of specifying+ numbers for "crashkernel=". Note, you need to have enough memory.+ The threshold and reserved memory size are arch-dependent.+ Dump-capture kernel config options (Arch Independent) -----------------------------------------------------

@@ -266,6 +275,13 @@ This would mean: 2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M 3) if the RAM size is larger than 2G, then reserve 128M

+Or you can use:++ crashkernel=auto++if you have enough memory. The threshold is 4G, below which this won't work.+Also the automatically reserved memory size would be 128M on x86, 256M on+other platforms that have KEXEC.